Dell Latitude L400 - Manual (Page 39)

When you attach a PS/2 mouse to the computer, the touch pad is automatically disabled if the Internal Touchpad option in the system setup
program is set to Auto Disabled (the default). To keep the touch pad enabled while an external pointing device is attached to the computer, go to
the Advanced screen of the
system setup program and set Internal Touchpad to Enabled.
If you are using a PS/2-compatible mouse that is not made by Microsoft and the mouse does not work properly, reboot the computer. If the mouse
still does not work, install the drivers from the diskette that came with the mouse and reboot the computer.
Keyboard
You can use the computer's keyboard and an external keyboard at the same time. When you attach a keyboard to the computer, the embedded
numeric keypad is automatically disabled.
On an external keyboard, the key acts the same way as the key on the computer’s keyboard (if the External Hot-Key option
on the Advanced screen of the
system setup program is enabled) for certain key combinations.
External Numeric Keypad
When you attach an external numeric keypad to the computer, the numeric keypad on the computer keyboard is automatically disabled. The
indicators on the integrated keyboard track the operation of an external numeric keypad.
USB Devices
You can attach a USB hub device to the USB connector. The USB hub device can support multiple USB devices (typically low-speed peripherals
such as mice, keyboards, printers, and computer speakers).
Parallel Devices
You can attach a parallel device (usually a printer) to the 25-pin parallel connector. You can also connect the diskette drive to the parallel connector.
The parallel port sends and receives data in parallel format, where eight data bits (one byte) are sent simultaneously over eight separate lines. The
port can be configured as a unidirectional (output-only) port for devices such as a printer or as a bidirectional port for devices such as a network
adapter.
The computer's integrated parallel port is designated as LPT1. The Microsoft ® Windows® 98, Windows 2000, and Windows Me operating
systems automatically recognize the parallel device and configure it correctly. The parallel port can also be configured for compatibility with the
PS/2 standard.
Connecting a Diskette Drive to the Parallel Connector
You can use the diskette drive as a second external device if you already have a device connected to the media bay connector. The diskette drive
letter is A, unless a diskette drive is already installed in the external media bay, in which case the drive connected to the parallel connector is drive
B.
To connect the drive to the parallel connector on the I/O panel, use the optional parallel diskette-drive cable (available from Dell), as shown in
Figure 2.
Figure 2. Connecting a Diskette Drive to the Parallel Connector
NOTE: If the computer is in suspend (or standby) mode or S2D (or hibernate) mode when you attach an external keyboard, the device is
recognized immediately by the computer when it resumes normal operation.
NOTE: If the computer is in suspend (or standby) mode or S2D (or hibernate) mode when you attach an external numeric keypad, the
device is recognized immediately by the computer when it resumes normal operation.